Expansion-bolt.



EXPANSIDN-BOLT.

mmm l Speccation of Letters Patent.

Patented Aug. 27, i943.

gpplicatonled February 18, 1918. Serial No. 217,?74.

To all whom z't may concern:

Be it known that a citizen of the United States, residing at St. Joseph, in the county of Berrien and State of Michigan, have invented a certain new and useful Improvement in Expansion- Bolts, of which the following-.is a specication.

My invention relates to expansion bolts, or equivalent mechanism, for detachably connecting two adjacent members together where it is desirable that when the parts to be connected together are separated, the attaching mechanism shall also be readily removable, and in which, when the members arelattached together, the attaching devices sha The object of the invention is to provide mechanism of this class which can be easily and cheaply made, which is simple in operation, and not readily liable to get out of order.

The invention consists in the mechanism for carrying out the foregoing objects, and particularly, in an expansion bolt device for use in the bodies of automobiles, and the like, in which a preliminary rotation of the locking `nut rst secures the bolt device in place in one of the members to be secured so that subse operates e ciently to force the second member to be secured into engagement with the rst. yThe invention further consists in the features and details of construction which willv be hereafter more fully set forth in the specication and claims. v

Referring to the drawings, in which similar numerals indicate the same parte throughout the several views,

Figure 1 is a side view of an automobile body having a supplemental part, as fory a Victoria top .de-

instance, the frame of by the mechanism tachably secured thereto of this invention.

ig. 2 is an enlarged sectional detail view taken through the securing mechanism, on, for instance, the line 2-2, of Fig. 1.

Fig. 3 is a perspective view of the two automobile body parts and the bolt device, separated one from the other.

F ig. 4 is a perspective view of the expansible cylinder and the expanding cone on the securing mechanism.

en an automobile main body 10 is to be equipped with a supplemental body 12 I, CLARENCE L. BAIE,

be as compact and simple as possible.

uen-t rotation of the locking nutwhich can be removed at will, the problem arises of providing ready means for detachably securing'one to the other which will do its securing or fastening Work eliciently and, at vthe same time, be readily the parts are separated. lnv the device of this invention the result is accomplished by providing, through the iirst member 10 to be secured, abolt receiving hole or perforation 14 in alinement with a corresponding hole 16 in a part 18 carried by the second member 12 to .be secured, and by inserting through these perforations' 14 and 16 the novel formv of expansion bolt device here shown and described.

rlhe securing mechanism proper consists in a screw threaded bolt 20 Ihaving lthreaded on oneend a conical expanding member 22 fitting inside a cylindrical expansi'ble member 24, the two being prevented from rotatlngrone or the other, but permitted to slide lengthwise one or the other through the agency of a lu'g 26 on one of the members traveling in a slot 28 in the other. y particular case here illustrated, the lug is on the expanding member and the slot is in the lexpansible member. The opposite screw threaded end of lthe bolt 2O carries a washer 30 and a nut 32, hereafter referred 'to as a clampingmember, adapted tobear against the outside of the member 18 of the second member 12 to be secured. 4On the bolt 20 and between the washer 30 and the expansible member 24 is a compression spring 34 of greater expanded thickness than the thickness of the member 18 which is to be attached to the automobile body.

he result of the foregoing construction is that when it is desired to assemble together the two automobile` body parts, the operator, ai'ter placing them in the position shown in Fig. 2, inserts the bolt mechanism with all parts loose inside of the opening let- 16. He now applies a wrench to the nut 32 and starts to rotate it. The rst two or three turns of' the nut slightly compresses spring 34, thus tending' to pull expander member 22 into expandible member 24 and this operation continues until the leaves of the expandible member have been forced outward toward the walls of hole 14 lin member 10, suciently to cause the member 24 to grip said wall. "Furth-er rotation of the nut 32 now simply compresses spring 34 as much as is necessary to bring member ln the 

